package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *
 *
 * Version 3.0 升级 双向链接【客户端与服务器相互说话】 多人聊天室 Version 2.3
 *
 */
public class Server {
    private ServerSocket serverSocket;
    public Server(){
        try {
            serverSocket=new ServerSocket(4545);
        }catch (BindException e){
            System.out.println("端口号重复创建，建议换个端口号");
        }catch (IOException e) {
            System.out.println("申请端口号失败....");
        }
    }


    public void start(){
        try {
            while(true) {

            System.out.println("---等待客户端连接---");
            Socket  socket = serverSocket.accept();
            String ip = socket.getInetAddress().getHostAddress();
            System.out.println(ip + "客户端链接成功了");


             new Thread(new CS(socket)).start();

        }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {

            if(serverSocket!=null&&serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                 System.out.println("服务器关闭失败");
                }
            }
        }

    }
    public static void main(String[] args)  {
        new Server().start();
    }

    private class CS implements  Runnable{
        private Socket socket;
        private String ip;
        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }

        public void run() {
            PrintWriter pw=null;
          //BufferedReader br=null;
            try {
                //1.读入定义
           BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
                //2.定义写法
           pw=new PrintWriter(new BufferedWriter( new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
                //1.1读入功能：存线程中
                new Thread(()->{
                    try {
                        String message;
                        while((message=br.readLine())!=null){
                            System.out.println(ip+"客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务器端请输入");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败");
                    }
                }).start();
                //2.1 提供写方法：控制台输入
            Scanner input=new Scanner(System.in);//后台卡住
                while (true) {
                    System.out.println("服务器端请输入：");
                    String say=input.nextLine();//得到控制台输入值
                    //打印：服务器端说的文本
                    pw.println("服务器说:"+say);
                }
            }catch (NullPointerException e){
                System.out.println("IO流传输对象，有对象为null，立马核对，建议：查看try块中对象可以没有对象");
            }catch (UnsupportedEncodingException e){
                System.out.println("客户端或者服务器端：字符集不一致");
            }catch (IOException e) {
                System.out.println("通讯过程当中，传输出现错误！");
            } finally {
//                try {if (br!=null)
//                   br.close();
//               }catch(IOException e){
//                    System.out.println("结束通讯：关闭失败！");
//               }
                if(socket!=null&&socket.isClosed()){
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("服务器关闭失败");
                    }
                }
            }
        }
    }
}



